A falling bear, a daring tightrope walk and a sensational stop-motion waterdrop image make this week's retrospective.

Gallery View:Week in pictures 27/4/12

Watch out below! A tranquillised bear falls from a tree outside Colorado University, US, after it was shot by wildlife officials. The 200-pound bear climbed the tree in an attempt to escape the University after a scavenge hunt.

Watch out below! A tranquillised bear falls from a tree outside Colorado University, US, after it was shot by wildlife officials. The 200-pound bear climbed the tree in an attempt to escape the University after a scavenge hunt.